I think it's a familiar cycle, to get burned out. Three months ago was March, and March was nasty up here in the NE--I rode home in ice storms, just about lost my desire to ride. I took a day off, and rode different routes. I rode for fun instead of to work because riding in there actually wasn't fun...so I added a couple loops to the commute and that helps.

Get back on the bike and ride in circles around the yard, the driveway, whatever you've got. It's FUN. It feels GREAT. Just get back on. I think the rest will come to you if you just start again.

My personal motivations are to drive as little as possible and to bike instead, to get fit enough to race, and to race 'cross, and to prove to the lunky guys at work that a chick can do it...even when they won't/can't. It's my own foolish pride and a point of principle, but if I won't ride, I have to walk instead of driving. And I hate the walk to work. So I ride.